数值技术

Based on the analysis, the paper makes use of the option-game theory to establish the different value model, including the time ascertainable and the time uncertain of new technology coming, and then analyzes the strategy of two enterprises.

在此基础上区别于以往的研究，本文综合引入了竞争、成本差异、新技术到来时间不确定及利润流等因素，建立了竞争环境下两家企业技术采纳行为的期权博弈模型，并进行数值分析与讨论。

Based on a formal analysis of lifting decomposition, the hierarchical structure concept of the decomposition set, as well as the lifting decomposition technique of the polyphase matrix' greatest mth-order common divisor, is proposed to conquer the difficulties in the practical computation of and the optimal search in the huge decomposition set.

本文在形式化分析Lifting分解原理的基础上，提出了分解集合的分级结构概念以及多相矩阵的m阶最大公因子Lifling分解技术，克服了分解集合求解问题的高复杂性所带来的实际计算与搜索困难；进一步地，从数值稳定性及计算代价两方面研究了分解的评价问题，设计出两种实用的分解稳定性准则；最后，结合分级结构技术提出一种最优分解算法。

In the background of numerical simulation for the transonic flow about advanced transport aircraft with wing-mounted nacelles, great efforts have been made in this thesis for the improvement of the grid generation technique and the numerical methods for solving the Euler equations.

本文以民用飞机复杂外形跨音速绕流数值模拟及气动力分析为应用背景，在复杂空气动力外形网格生成技术，Euler方程数值求解方法的改进。。。

Second, the latest technology and high non-linear numerical aperture measurement techniques (such as STED and SSIM technology) combination.

二是将最新的非线性技术与高数值孔径测量技术（如STED和SSIM技术）相结合。

The proposed quasi three-dimensional numerical model in conjunction with the dynamic block-structured grid generation method is applied successfully in the studies on the VIV and FSI problem of the submarine free-span pipelines.

本文发展的准三维数值模型与新的动态块结构数值网格技术相结合，被成功应用于海底管线管跨结构涡致耦合振动问题的研究。

Firstly, based on the sliding mode control and backstepping technique, a new attitude tracking controller is derived to control the attitude motion of spacecraft, the stability of the system is analyzed via Lyapunov method and the reaction wheel dynamics is also considered from the real applications point of view. The whole design process is divided into two steps: the first step is to use sliding control technique to design suppositional adaptive variable structure controller; and the second step is to design attitude tracking controller based on SMC and backstepping technique. Numerical simulations are performed to show that both tracking maneuver and vibration suppression can be accomplished effectively.

首先，采用自适应后步法结合主动振动控制技术设计了姿态跟踪鲁棒控制器，基于Lyapunov方法分析了系统的渐近稳定性；在此基础上，显性地考虑了执行机构动态特性问题，将整个设计过程分为两个步骤：第一步采用滑模控制技术设计了变结构虚拟控制器，给出自适应控制律的设计方法；第二步，将后步法与滑模控制技术相结合，设计了姿态跟踪鲁棒控制器，给出飞轮电压的输入算法及稳定性分析；最后，将提出的控制方法应用于挠性航天器的姿态跟踪控制，通过数值仿真对所提方法的可行性与有效性进行分析和验证。

Then the numerical simulation model of the oil pollutant migration in this kind of water-bearing system is constructed by means of the numerical simulation technology.

在分析水文地质条件的基础上，利用实验研究获得含水系统中连接上下含水层的弱透水层的渗透规律，然后运用数值模拟技术建立起此类含水系统中石油类污染质运移数值模拟模型。

The theoretical development of internal flow of turbomachinery is then summarized in terms of separation theory, vortex dynamics and flow pattern.

然后分别从分离流动理论、涡动力学和叶轮机械流型三个层次介绍叶轮机械内部流动理论的发展；从平面叶栅、环形叶栅、动态试验和试验技术等方面回顾叶轮机械试验研究进展；从控制方程、数值方法、网格生成等方面综述叶轮机械数值计算研究方法、研究内容及成果等，并概括改善叶轮机械气动性能的方法和现状。最后对叶轮机械内部流动研究进行展望。

In the process of building and using the mass concrete structures, because of the effect of out-side condition and themselves, some faults will form in the structure, these faults will effect the bearing capability and endurance Using nondestructive testing method to test the concrete"s quality and diagnose its healthy, which has the significant sense in assessing the safety stability and research of the administering diseasesThis dissertation mostly researched the testing methods in the mass concrete structure, discussed the principles, methods, features, sphere of application of the ultrasonic testing in the mass concrete structure with faults, used dynamic FEM to simulate the testing process, discussed when the concrete structure with cracks is under the effect of the pulse, how the elastic waves propagate and what are their changing feature, Researched the principles of the first-arriving waves" phase when the cracks" depths are not same, obtained the relation between the inversion point and the cracks" depth, which has the direction sense in the application of projects,The second part of this dissertation is CT , which used the ultrasonic wave running through the tested-substance to get arriving-time of the ultrasonic wave, then inverse the image This dissertation drawed one CT program which can well present the different little cells ultrasonic wave velocity profiles of the substance, thereby to diagnose the quality of the part of the tested-substance, CT has the better using foreground..

在混凝土结构的施工及使用过程中，由于受其自身及外界各种因素的影响，常常会产生一些缺陷，对结构物的承载能力和耐久性造成严重影响，采用无损检测技术进行质量检测和健康诊断，这对混凝土结构开展安全、稳定性评估以及病害隐患治理研究具有重要意义。本论文主要针对大体积混凝土结构缺陷的检测方法展开研究工作，重点讨论了超声波法检测混凝土结构裂缝的基本原理和方法及其特点、适用范围，运用动力有限元数值模拟其检测过程，探讨了有裂缝缺陷的混凝土结构在脉冲荷载作用下弹性波的传播及其变化特征，研究了不同裂缝深度下首波相位变化规律，得出了反转临界点与裂缝深度之间的关系，这对实际工程应用具有指导意义。声波CT是一种新的无损检测技术，它是利用声波穿透被检测体获取声波接收时间，来进行计算机反演成像的技术。本文利用直射线法编制了层析成像程序，能较好地呈现被检测物体各微小单元的声波速度分布图像，从而对检测体的质量状况作出诊断评估，具有较好的应用发展前景。

In recent years, numerical simulation technology has been widely used to analyze problems of wrinkle, fracture, et al. during the forming of sheet metals, which lays foundations for obtaining FLD via numerical simulation.

近年来板材成形中开始广泛使用数值模拟技术来分析板材成形中的起皱、破裂等问题，为数值模拟获得成形极限图奠定了基础。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。